Springside was the estate of Matthew Vassar in Poughkeepsie, New York, United States. It is located on Academy Street just off US 9. Detailed plans for a landscape and complex of farm buildings were drawn up by the influential Andrew Jackson Downing prior to his death. The landscaping was completed and remains Downing's only surviving work, but only a few of the buildings were ever built and most have since been lost to fire and structural failure. A cottage where Vassar resided, Downing's only known surviving building, had to be dismantled and removed in the mid-1970s. Its facade is on display in the New York State Museum.